Alarm for automobiles



May 8, 1923. 1,454,216

. w. B. EBERLY ALARM FOR AUTOMOBILES Filed Nov. 26 1919 *A mm L NEPatented may 8, I923.

OFFICE.

B. EBERLY, OF MECHANICSBURG, PENNSYLVANIA.

ALARM FOR AUTOMOBILES.

Application filed November 28, 1919. Serial Nb. 340,789.

To all whom it may concern: I

Be it known that I, 'WEIR B; EBERLY, a citizen of the United States,residing at Mechanicsburg, in the county of Cumberland and State ofPennsylvania, have invented a new and useful Alarm for Automobiles, ofwhich the following is a specification.

This invention relates to a burglar alarm for use in connection withautomobiles, one of its objects being to provide an alarm which will besounded when any movable part of the automobile is shifted by anunauthorized person, it being impossible to stop the sounding of thealarm until the 1 owner or driver of the car can insert a proper key forthe purpose of breaking the electric circuit to the alarm.

A further object is to provide a device of this character adapted to beplaced inside of the hood of the automobile, where it cannot be reachedexcept by raising the hood, it being intended to connect a switch to thehood so that when the hood is raised by an unauthorized person after thealarm has been set, the alarm will be.sounded.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that, within the scope ofwhat is claimed, changes in the precise embodiment of the inventionshown can be made without departing from the spirit of the invention.

In the accompanying drawing the preferred form of the invention has beenshown.

In said drawing Figure 1 is. an elevation of the mechanism, parts beingshown in diagram and two positions of the circuit closures beingindicated byfull lines and dotted lines respectively.

Figure 2 is a side elevation, on a reduced scale, of a portion of anautomobile and showing the location of the apparatus under the hood.

formed within a spring strip 6 constituting a circuit closer so as tohold said strip elevated out of normal position, as shown in full linesin Figure 1. Arranged under this strip 6 is another spring 7constituting a contact and which is adapted to be engaged by the strip 6when said strip is released from the armature 3. This position of theparts is shownby dotted lines in Figure 1. Another spring strip 8 ismounted in the casing directly above but normally out of contact with aspring strip 9. A cam 10 is mounted for rotation in the casing and inthe direction indicated by the arrow'in Figure '1. It is designed torotate this cam by means of a key insertible through the dash by thedriver. I

A siren or other alarm indicated at 11 is adapted to be arranged underthe hood and is electrically connected by a conductor 12 to the strip 9.Another electrical conductor 13 extends from the strip 8 to one terminalof the magnet 2 while the other terminal of the magnet is connected asat 14 to the strip 6. The strip 7 has an electrical conductor 15extending therefrom to a battery 16 which, in turn, is connected to thesiren 11 by a conductor 17. The armature 3 has an electrical conductor18 connecting it to the conductor 15 and this conductor 18 is providedwith shunts 19 in which are arranged circuit closers or switches 20which can be located at different points on the motor vehicle.

For example one of these switches can be arranged at each of the sidedoors, another upon the tire holder located either at the side or backof the vehicle, another under the hood so that should the hood be raisedthe switch would be closed. In fact switches can be located whereverdesired, a different shunt being provided for each. Thus after the partshave been set, should any one of the movable portions of the machine beshifted out of normal position, one of the switches 20 would be closed.a

When the user of the machine inserts a key into engagement with the cam10 and rotates said cam in the direction indicated by the arrow inFigure 1, the cam will first come against the strip 6 and lift it intoengagement with the armature 3. The cam will then be brought intoposition against the strip 9 and will lift it into contact with strip 8.The key is'then removed leaving the parts all set. Should any one of themovable parts of the machine be shifted by an unauthorized person theswitch 20 controlled thereby would be closed. This would cause thecurrent to be set up from the battery 16 through the shunt 19 toconduetor 18, to the armature 3, to the strip 6, to the electromagnet 2,to the conductor 13, strips 8 and 9, conductor 12, siren 11 andconductor 17. Thus the electromagnet will be promptly energized and atthe same time the siren will be sounded. As soon as the electromagnet isenergized it will attract its armature and release strip 6 which willdrop into contact with strip 7., Thus another circuit will be set upfrom the battery 16 through the conductor 15, the strips 7 and 6, thencethrough the magnet 2, conductor 13, strips 8 and 9, and the conductors17 and 12 to the siren. Consequently the siren will continue to soundeven though the switch 20 should be shifted to open position and thissounding of the siren will continue until the holder of the key insertsit and ro tates the cam 10 so as to break the contact between the strips8 and 9. The parts can again be set by repeating the foregoingoperation, the rotation of the cam 10 lifting the strip 6 intoengagement with the armature and also lifting the strip 9 into contactwith the strip 8.

What is claimed is The combination with an automobile-of a housingsecured to the dash and mounted under the hood of the engine, anelectromeagre magnet within the housing, a shiftahle contact strip, anarmature normally spaced from the magnet and engaging said contact stripto support one end thereof, a contact strip normally spaced from but inposition to be engaged by the supported strip,

an audible signal devlce, a source of electrical energy connectedthereto electrically, contacts included in a circuit between the signaldevice and the electromagnet, a cam. for holding the last named contactsnormally together, one of said contacts being e cuit to the audiblesignal independently of to subsequent movement of the switch, said cambeing movable to engage the released shiftable contact and return itinto engagement with the armature.

In testimony that I claim the foregoing as my own, it have heretoaffixed my signature in the presence of two witnesses.

WEIR B. EBERLY, Witnesses:

A. E. SIJEBER, ANDREW M. Beer.

